Two Vietnamese archers qualified for the men's and women's individual recurve, respectively, at the Games, by reaching the semifinal stage and obtaining one of three available spots each at the 2019 Asian Championships in Bangkok, Thailand.

2019 Southeast Asian Games silver medalist Nguyễn Văn Đương scored an outright quarterfinal victory to secure a spot in the men's featherweight division at the 2020 Asia & Oceania Qualification Tournament in Amman, Jordan,[5] while Nguyễn Thị Tâm replacing the North Korean slots after withdrawn from the Olympics.

Lê Thanh Tùng secured one of the three spots available for individual-based gymnasts, neither part of the team nor qualified through the all-around, in the vault exercise at the 2019 World Championships in Stuttgart, Germany.

Vietnam qualified one boat in the women's lightweight double sculls for the Games by winning the silver medal and securing the second of three berths available at the 2021 FISA Asia & Oceania Olympic Qualification Regatta in Tokyo, Japan.

Trương Thị Kim Tuyến secured a spot in the women's flyweight category (49 kg) with a top two finish at the 2021 Asian Qualification Tournament in Amman, Jordan.