Sitnumnoi has training records with Chinsopolsup, Suwit Gym, and SidNoomnoi gym. Under his mentorship and tutelage, he successfully turned the following into professional boxers and champions in his twenty years of being a trainer:
- Singsuk SuwitGym – Winner of Windy Sports Thai Boxing Championship
- Rung Anun SidNoomnoi – Winner of 007 Thai Boxing Championship on Channel 9; Runner-up of Shell Rimula Thai Boxing Championship on Channel 3
- Thongsuk SingPatong – Winner of the 8th Tiger Cement Thai Boxing Championship on Channel 7
- Thongrun SidNoomnoi – Runner-up of Mah Dang Thai Boxing Championship
- Pen Ake – Winner of 126-pound Siam Aom-Noi Stadium Thai Boxing Championship
Sitsumnoi is currently the superintendent, manager, and trainer of SingPatong and SingNoomnoi Thai Boxing Gym.