In October 2013, Miyoshi was selected the Japan U-17 national team for 2013 U-17 World Cup. In May 2017, he was selected the Japan U-20 national team for 2017 U-20 World Cup. In May 2019, he was selected the Japan national team for 2019 Copa América. At this tournament, he debuted against Chile on June 17. He played all 3 matches and scored 2 goals against Uruguay.