In June 2001, Yamase was selected the Japan U-20 national team for 2001 World Youth Championship. At this tournament, he played all 3 matches and scored 2 goals. On August 9, 2006, he debuted for the Japan national team under new manager Ivica Osim against Trinidad and Tobago which is Japan's first match after the 2006 World Cup. He played 13 games and scored 5 goals for Japan until 2010.