Thailand qualified a single boat (women's C-1 200 m) for the Games by winning the gold medal at the 2021 Asian Canoe Sprint Qualification Regatta in Pattaya, marking the country's debut in the sporting discipline.

[12] Thailand qualified one boat in the men's lightweight double sculls for the Games by finishing second at the B-final and securing the last of three berths available at the 2021 FISA Asia & Oceania Olympic Qualification Regatta in Tokyo, Japan.

[16] Orawan Paranang topped the field of table tennis players from Southeast Asia in the round robin at the Asian Qualification Tournament, thereby joining Sawettabut on the country's roster for her maiden Games.

Rio 2016 bronze medalist Panipak Wongpattanakit qualified directly for the women's flyweight category (49 kg) by finishing among the top five taekwondo practitioners at the end of the WT Olympic Rankings.

On the men's side, Ramnarong Sawekwiharee scored a semifinal victory in the flyweight category (58 kg) to book the remaining spot on the Thai taekwondo squad at the 2021 Asian Qualification Tournament in Amman, Jordan.