After the retirement, Moriyasu started coaching career at Sanfrecce Hiroshima in 2004. In 2007, he became an assistant coach for the top team. In 2010, he moved to Albirex Niigata. In 2012, he returned to Sanfrecce and became a manager. The club won the J1 League champions in 2012, 2013 and 2015. However the club results were bad in the 2017 season and he resigned in July. In October, he became a manager for Japan U-23 national team. In April 2018, he also became an assistant coach under the manager Akira Nishino for Japan national team. After the 2018 World Cup, Moriyasu became a new manager as Nishino successor. In 2019, Japan won the 2nd place at 2019 Asian Cup.