He played for Japan national team.
After graduating from Kwansei Gakuin University, Oyama played for Osaka SC many Japan national team players Toshio Miyaji, Uichiro Hatta, Sakae Takahashi and Kiyonosuke Marutani were playing in those days.
In May 1925, Oyama was selected Japan national team for 1925 Far Eastern Championship Games in Manila.
But Japan lost in both matches (0-4, v Philippines and 0-2, v Republic of China).
This biographical article related to a Japanese association football defender is a stub.