On May 31, 1992, Moriyasu debuted for the Japan national team against Argentina. In 1992, he was selected the Japan for 1992 Asian Cup which held in Japan and Japan team won the champions. In 1993, he played at 1994 World Cup qualification in Doha. However Japan failed to qualify for the 1994 World Cup. It was known as the "Agony of Doha" () in Japan. He played 35 games and scored 1 goals for Japan until 1996.