The 1.69 m (5 ft 7 in) tall athlete at 54 kg (119 lb) is a member of Enkaspor, where she is coached by Tayfun Aygün.In her early years she competed in the heptathlon event.
Sema Apak qualified for participation in the 4 × 400 m relay event at the 2012 Summer Olympics.Her personal best time in the 400m hurdles is 56.62 scored 2012 in Ankara, Turkey.She is married to Olympic bronze medalist hammer thrower Esref Apak.
The couple has a son named Ali.At the 2013 Islamic Solidarity Games held in Palembang, Indonesia, she won a gold medal in the 4x100 event with teammates Saliha Özyurt, Birsen Engin and Nimet Karakus, a silver medal in the 4x400 event with teammates Özge Akin, Birsen Engin and Esma Aydemir as well as a bronze medal in the long jump event.