After the retirement, Oenoki started coaching career at Shimizu S-Pulse in 2003. In 2004, he became a manager his alma mater Waseda University. In 2008, he returned to Shimizu S-Pulse and served as a manager for the youth team. In July 2014, he was promoted to a manager for top team as Afshin Ghotbi successor. However the club performance is bad he resigned in July 2015.