John Batch has decided to step down as manager of Ryman Premier Division side Canvey Island.
First-team coach Glen Alzapiedi will replace him until the end of the current season.
Batch, who had been in charge for almost six years, will stay at the Essex club as a director.
Chairman George Frost said: "John has decided that the time is right for change, his business interests require more of his time."
Alzapiedi, a former manager of Ware, Harlow and Waltham Abbey, joined Canvey ahead of the 2010/11 season.
The Gulls, FA Trophy winners in 2001, are currently 10th in the Ryman Premier Division.