After retirement, Tanaka started coaching career at NKK in 1989. In 1993, he became a manager for the Japan U-20 national team. At 1995 World Youth Championship, he led U-20 Japan to advanced to the quarter-finals. In 1995, he signed with Nagoya Grampus Eight and became an assistant coach. In November 1997, he became a manager as Carlos Queiroz successor. He was sacked in April 1999. In 2001, he signed with J2 League club Shonan Bellmare and managed the club until 2002.