[1] Siddiqui represented Pakistan at the 2008 Summer Olympics in Beijing where she competed in the Women's 100 metres event, placing seventh in her heat without advancing to the second round.
In 2006, at the South Asian Games held in Colombo, Sri Lanka, Sadaf won a bronze medal in the women's 100m race.
[2] Siddiqui was also part of the women's relay team participating in the Colombo 2006 South Asian Games along with Saira Fazal, Naseem Hameed and Nadia Nazir.
[1][5] In the Dhaka 2010 South Asian Games, Sadaf along with athletes Nadia Nazir, Naseem Hameed and Javeria Hassan[6][7] was part of the women relay team that won bronze medal.
She appealed to the Minister Sports Khyber Pakhtunkhwa Syed Aqil Shah at Olympic Secretariat to remove her ban.