Satoyama Kōsaku (born May 31, 1981) is a retired professional sumo wrestler from Ōshima, Kagoshima Prefecture, Japan.

[1] He made his way quickly up the ranks, recording only one make-koshi along the way to sekitori status, which he achieved in January 2006 upon promotion to the jūryō division.

In July 2008 he returned to form and won the makushita championship with a 6–1 score after an eight-way playoff, defeating his 232 kg stablemate Yamamotoyama Ryūta in the final.

However he achieved his majority of wins against losses in the January 2012 basho, coming from 0–3 down to score 4–3, and this was enough to return him immediately to jūryō.

He was promoted to the top division in July 2015 and again in March 2016, but a kachi-koshi or majority of wins in a makuuchi tournament continued to elude him.

He has stayed with the Japan Sumo Association as a coach at his stable initially under the borrowed elder name of Sanoyama Oyakata (owned by Chiyootori).

At 1.76 m (5 ft 9+1⁄2 in) and 119 kg (262 lb) Satoyama was one of the smallest sekitori and had to rely on technical skill to defeat his heavier opponents.

[3] Sanshō key: F=Fighting spirit; O=Outstanding performance; T=Technique     Also shown: ★=Kinboshi; P=Playoff(s) Divisions: Makuuchi — Jūryō — Makushita — Sandanme — Jonidan — Jonokuchi