Miyakawa began the 2016 season at the International Gymnix where she won the silver medal on vault behind Shallon Olsen and placed sixth with her team, seventh on uneven bars, and eighteenth in the all-around. In April, she placed seventh in the all-around final at the All-Japan Championships. She went on the place eleventh in the all-around at the NHK Trophy. Then at the All-Japan Event Championships, she won the gold medal on the vault and placed sixth on the floor exercise. She was then named to represent Japan at the 2016 Summer Olympics alongside Asuka Teramoto, Mai Murakami, Aiko Sugihara, and Yuki Uchiyama, and they placed fourth in the team final behind the United States, Russia, and China.