He is the founder of Singpatong Gym in 1971. Somsak Julka is the man behind the successful fighters honed for professional boxing. Some of his successfully trained boxers are  Pinyo SingPatong, Yokkhew Ledmongkol, Pasang SingPatong, Howharn LukChaoPhaya, Singpaibul Teanhirun and Puengloang SingPatong. These great boxers were extensively trained by Somsak.

Somsak is currently the superintendent and trainer of SingPatong and SingNoomnoi Thai Boxing Gym.