In June 1997, Yamashita was selected the Japan U-20 national team for 1997 World Youth Championship. He played in 2 matches. In 2001, Yamashita was selected the Japan national team for 2001 Confederations Cup. He made his international debut in the tournament on June 4 against Brazil. At this tournament, Japan won the 2nd place. He earned 3 caps between 2001 and 2003 and scored no goals for Japan.