Sittha was a member of the Muangthong United youth academy before he joined high school team Assumption College Thonburi.
He made his debut in Port 0–3's defeat against Ulsan Hyundai as part of the 2022 AFC Champions League qualifying play-offs.
[2] In August 2022, Sittha was loaned to Thai League 2 club Customs United.
[4] In June 2023, alongside Teerasak Poeiphimai, he was sent abroad to train with Leicester U21 for a month.
[5][6] In September 2023, Sittha was named in Thailand Olympic 21-men squad for the 2022 Asian Games.