Goodway will be replaced by the Australian Bob Lindner who was Oldham's player-coach in 1994. His departure, which was described as being "by amicable agreement", but which was at the board's instigation, also sees his No 2, Alan McCurrie, leave Boundary Park.
Oldham have won just one Super League game this season and their chairman, Jim Quinn, said: "Things have not been right behind the scenes since Andy threatened to quit after the defeat at Salford."
Lindner, an Australian Test forward, will arrive by the end of the week, if work permit formalities can be completed in time, and would then take charge for the home fixture against Halifax. Until then, the fitness conditioner, Andrew Jackson, and players Martin Crompton and Matt Munro will oversee preparations.
Goodway is the fifth Super League coach to go in the two months since the start of the season, following Wigan's Graeme West, Steve Simms at Halifax, John Dorahy at Warrington and Castleford's John Joyner.
A scan on the hamstring injury suffered by the St Helens centre Alan Hunte has confirmed that there is a tear, but he could still be fit for the Challenge Cup final on Saturday week. Derek McVey, the Saints forward out of action since damaging ankle ligaments on Good Friday, has described his chances of proving his fitness in time for Wembley as "better than average".
Mike Forshaw, the former Wigan and Wakefield forward who has been playing for Saracens, has joined Bradford.
The game in Australia has lost a major sponsor as the result of a brawl in a televised match between two schools. The Commonwealth Bank - Australia's second largest bank - which has supported the knock-out competition between secondary schools since 1980, has stopped its pounds 50,000 a year backing following a vicious punch-up involving two Brisbane sides.
"The bank does not condone violent behaviour and found this completely unacceptable," it said in a statement.
Twelve players from one school have been suspended for periods ranging from one week to 12 months.Reuse content