Thungthongkam competed in 2004 Athens Olympics in the women's doubles with partner Sathinee Chankrachangwong. They defeated Denyse Julien and Anna Rice of Canada in the first round and Chikako Nakayama and Keiko Yoshimoti of Japan in the second. In the quarter finals, Thungthongkam and Chankrachangwong lost to Yang Wei and Zhang Jiewen of China 2–15, 4–15. She also competed in the mixed doubles with partner Sudket Prapakamol. They had a bye in the first run and were defeated by Frederik Bergstrom and Johanna Persson of Sweden in the 16th round.