After winning a silver medal at the Asian Junior Championship in 1994 with a lifetime best of 10.45, Sayan Namwong was picked for the 4×100 m team representing Thailand at the 1994 Asian Games, placing 5th. In 1996 he ran on the 4×100 m Olympic team, his last international appearance.
Personal Best: 100 – 10.45 (1994).
| Games | Discipline (Sport) / Event | NOC / Team | Pos | Medal | As | |
|---|---|---|---|---|---|---|
| 1996 Summer Olympics | Athletics |  THA |
Sayan Namwong | |||
| 4 × 100 metres Relay, Men (Olympic) | Thailand | 4 h3 r1/3 |
