Sanne Keizer (born 6 February 1985) is a Dutch beach volleyball player who plays as a right-side defender with her partner Madelein Meppelink.

She is a two-time European Champion and she represented the Netherlands at the 2012 Summer Olympics, finishing ninth with Marleen van Iersel.

Keizer and Meppelink found success quickly, medalling on the World Tour twice in their first season together and winning the 2018 European Championships.

[6] During her temporary retirement from beach volleyball, Keizer earned a master's degree in criminal investigation[7] and worked as a police detective in The Hague.

[1] She is married to beach volleyball player-turned-coach Michiel van der Kuip,[8][10] and the couple have two children, twins born in 2016.

[11] Keizer made her international beach volleyball debut at the 2002 U18 European Championships in August, where she and Arjanne Stevens won the silver medal.

[13][14] Following her success on the junior circuit, Keizer debuted on the FIVB World Tour in 2003, partnering with Merel Mooren at the $150K Hellas Open in June.

[12] Towards the end of the season, the pair had accumulated sufficient ranking points to directly enter the World Tour main draws of the $180K Milan and Rio de Janeiro Opens,[16][17] finishing 25th and 17th respectively.

20 seeds in St. Petersburg, they recorded a three-set upset over the third-seeded Tian Jia and Wang Jie of China, before falling to the eighth-seeded Nila Håkedal and Ingrid Tørlen of Norway in the fourth round of the losers bracket.

16 seeds, scoring upsets over the higher-seeded Cuban teams of Milagros Crespo and Imara Esteves Ribalta, and Dalixia Fernández and Tamara Larrea.

[20] Throughout the course of their partnership, Keizer and Leenstra were also active on the Nestea European Championship Tour, winning bronze medals at the €55K German and Swiss Masters in 2006.

[12] After failing to qualify two years prior,[21] Keizer took part in the 2006 edition of the European Championships with Leenstra; they fell short of their No.

Keizer and de Vries came through the qualifiers and upset two of the top-ten seeds on their way to the Round of 16, where they were defeated by Maria Elisa Antonelli and Vanilda Leão of Brazil.

Seeded 26th once more, they came back from a first-set loss to beat the fourth-seeded Talita and Renata of Brazil in the Round of 16, before losing to Ukraine's 27th-seeded Svitlana Baburina and Galyna Osheyko in the quarterfinals.

They lost to Brazil's top-seeded Juliana Silva and Larissa França in the semifinals, then went on to beat the USA's 26th-seeded Angie Akers and Tyra Turner in the bronze-medal match.

7, they reached the gold-medal match with upsets over three of the top-five seeds, then capped off an undefeated tournament run with a 15–21, 26–24, 15–13 victory over Jennifer Kessy and April Ross of the United States.

Later that same month at the $190K Myslowice Open, Keizer and van Iersel were sent to the losers bracket in the third round of the double-elimination competition by Italy's Greta Cicolari and Marta Menegatti.

8 seeds, losing only to the fourth-seeded Misty May-Treanor and Kerri Walsh Jennings of the United States in the semifinals, before beating the third-seeded Brazilian duo of Maria Elisa and Talita to win the bronze medal.

They progressed to the quarterfinals where they were upset by the 16th-seeded Barbara Hansel and Sara Montagnolli of Austria, a team that they had beaten earlier in the group stage.

In their quarterfinal match against Belgium's seventh-seeded Katrien Gielen and Liesbeth Mouha, the home side rallied from a set down to win 18–21, 21–15, 15–10.

In the semifinals, they beat the Czech Republic's top-seeded Lenka Háječková and Hana Skalníková, and were subsequently crowned the new European Champions with a victory over Vassiliki Arvaniti and Maria Tsiartsiani of Greece in the championship match.

[36] Seeded ninth, they lost their first two group stage matches against the 16th-seeded Elsa Baquerizo and Liliana Fernández of Spain, and the fourth-seeded Kessy and Ross of the United States.

21 seeds Ana Gallay and María Zonta ensured they advanced to the Round of 16 where they faced the USA's third-seeded May-Treanor and Walsh Jennings.

They also took part in the European Championships, advancing to the Round of 16 where they lost the deciding set against their compatriots Jantine van der Vlist and Marloes Wesselink.

[22] After 11 years competing on the World Tour,[10] Keizer decided to retire at the end of 2013 to focus more on her personal life and police work.

[38] She partnered with Sophie van Gestel to compete at the $500K Transavia Grand Slam mid-2014; they lost all three of their group stage matches and did not progress further.

[10] The pair advanced to the Round of 16 before they were eliminated by Brazil's Maria Elisa and Carolina "Carol" Solberg Salgado; the Brazilian duo went on to win the tournament.

In the semifinals, they lost to the fourth-seeded Fernanda Alves and Bárbara Seixas of Brazil, but came back the next day to beat Maria Elisa and Carol to claim the bronze medal.

[10] Olympic gold medalist Dain Blanton noted at the 2018 Vienna Major that Keizer has an aggressive and physical playing style[42] to go along with being a well-rounded player.