In April 1999, Motoyama was selected the Japan U-20 national team for 1999 World Youth Championship. At this tournament, he played all 7 matches as left side midfielder and Japan won the 2nd place. On June 18, 2000, Motoyama debuted for the Japan national team under manager Philippe Troussier against Bolivia. In September 2000, Motoyama was selected the Japan U-23 national team for 2000 Summer Olympics. He played 3 matches as substitute midfielder. In September 2003, Motoyama played for Japan under manager Zico for the first time in 3 years. After that, he played many matches as substitute. In 2004, he was selected Japan for 2004 Asian Cup. He played 4 matches and Japan won the champions. He was also member of Japan for 2005 Confederations Cup. He played 28 games for Japan until 2006.