Osaka University of Commerce
Okayama practiced judo at junior high school and high school, and obtained a second degree black belt. He started playing basketball when he was eighteen at Osaka University of Commerce. In 1975, when his height was about , he was recruited by the University of Portland; he spent two years there, but a medical check revealed gigantism and he never played for the varsity team. After graduation, he joined the Sumitomo Metal Sparks basketball club. He represented Japan between 1979 and 1986 before he retired in 1996. As of 2005, he worked for Sumitomo Metal Industries and was active as a basketball coach.