On May 28, 1995, Soma debuted for Japan national team against Ecuador. After debut, he became a regular player as left side-back and left midfielder. In 1996, he played in all matches included 1996 Asian Cup. At 1998 World Cup qualification in 1997, Japan won the qualify for 1998 World Cup first time Japan's history. He played in all matches at 1998 World Cup. He also played at 1999 Copa America. He played 58 games and scored 4 goals for Japan until 1999.