In September 2016, Miyazawa was selected the Japan U-17 national team for 2016 U-17 World Cup. She played at all 6 matches and Japan won the 2nd place. In August 2018, she was selected the Japan U-20 national team for 2018 U-20 World Cup. She played at all 6 matches. At final against Spain, she scored an opening goal and Japan won the championship.