[1] In 1980, Miyagi created a performance group at university and started his career as a director and actor.
Tenshu-Monogatari, by Kyoka Izumi, was highly successful with audiences and toured many cities in Japan, India and Pakistan.
Miyagi also presented Chushin-gura, originally written for Bunraku and Kabuki, for the 2nd edition of Theatre Olympics, held in Shizuoka.
He is a member of group P4 of Japanese directors, (Yukikazu Kano, Oriza Hirata, Satoshi Miyagi, Masahiro Yasuda).
As of 2011 he was the head of the International Department of Theater Interaction -Japan-, Secretary General of the BeSeTo (Beijing, Seoul, Tokyo) Theatre Festival, and the guest director of SPAC (Shizuoka Performing Arts Center ; managed by Tadashi Suzuki).