STRADBROKE Island Chamber of Commerce president David Thomson said it was wrong to rely on the Toondah Harbour project to provide jobs for miners.
Mr Thomson, also general manager of Stradbroke Ferries, said the state needed to consult businesses about the end of sand mining.
He said the chamber wrote to premier Annastacia Palaszczuk and Environment Minister Steven Miles asking them to include businesses in the decision-making process.
"They promised to consult us but where's the consultation?" he said.
"The 2019 deadline is three-and-a-half years away and that's all too short a time to do anything.
"We want to see the government's detailed long-term economic plan for the island.
"In 2011, under a previous government there were eight years to get this organised - but nothing has been done yet.
"Unless someone has got a fully-costed detailed plan sitting in a drawer, this (ending mining in 2019) will be impossible.
"Saying that sand mining jobs can be turned into construction jobs at Toondah Harbour is the easy answer - but it is the wrong answer."
Mr Thomson said it was business as usual at the chamber following an unsuccessful bid to oust him as president in May.
Capalaba MP Don Brown said the harbour project was perfect to help the island move away from sand mining and promote tourism.
