In October 1964, Tomizawa was selected the Japan national team for 1964 Summer Olympics in Tokyo. However, he did not play in the match. On March 14, 1965, he debuted for Japan against Hong Kong. In 1968, he was selected Japan for 1968 Summer Olympics in Mexico City. He played against Hungary in semifinal and Japan won Bronze Medal. In 2018, this team was selected Japan Football Hall of Fame. He also played at 1970 Asian Games. At 1972 Summer Olympics qualification in 1971, Japan's failure to qualify for 1972 Summer Olympics. This qualification was his last game for Japan. He played 9 games and scored 2 goals for Japan until 1965.