Shūdōkan

In 1907 Toyama was appointed "shihandai" (assistant master) to Itosu at the Okinawa Teacher's College, and he and Gichin Funakoshi, who later developed Shotokan karate, were the only two students to be granted the title of shihanshi (protégé).

In 1924 Toyama moved his family to Taiwan, where he taught in an elementary school and studied Chinese Ch'uan Fa, which included Taku, Makaitan, Rutaobai, and Ubo from teachers Chen Fo-Chai (陳佛濟) and Lin Hsien-Tang (林献堂).

Thus, the organization he founded fragmented after his death in 1966, although his student Toshi Hanaue maintained the original Shu Do Kan. A few other schools based on Toyama's teachings still exist such as Doshinkan.

Four of the nine schools (or Kwan's (Kan)) that merged to form Taekwondo have lineages that trace back to Toyama through three Korean men who trained in Japan while Korea was under Japanese occupation.

Kim Ki Whang received his 3rd dan from Toyama and had moved to the United States in the early 1960s to teach Taekwondo.