Joachim Kayi Sanda (born 29 November 2006) is a French professional footballer who plays as a centre-back for Premier League club Southampton.

From Antony, Hauts-de-Seine,[1] in September 2023 he signed a three-year professional contract with Valenciennes FC.

[2] He made his debut for the Valenciennes first team in Ligue 2 on 21 October 2023, starting against Grenoble Foot 38.

[3] In doing so, aged 16 years-old and ten months, he became the youngest player in club history.

[4][5] On 9 January 2025, he joined Premier League club Southampton on a four-year contract.