Search crews looking for a 14-year-old boy on Queensland's Sunshine Coast have found a body believed to be that of the missing teenager.

Michael Ryan disappeared a fortnight ago, sparking a major search of bushland in the Landsborough area.

Michael's bike was found in the Mooloolah Valley on Saturday, near where his mobile phone last recorded a signal.

The boy's grandmother Lloma Dunne told the media last Friday that while Michael loved exploring the bush, it was very out of character for him to be missing for so long.

Queensland police said in a statement a body had been found in dense bushland in Dularcha National Park on Wednesday.

"During today's searches police sadly located the body believed to be missing 14-year-old teenage boy Michael Ryan," the statement said.

"Formal identification is yet to be finalised.

"Our thoughts go out to Michael's family and friends, as well as everyone involved in the search during this difficult time."

Police will prepare a report for the coroner.