The Sunshine Coast Council says there has been major erosion on beaches across the region.

Most beaches remain closed today because of dangerous surf and debris in the water.

Lifeguards are warning people not to swim at closed beaches, saying anyone swimming will be hit with a $200 fine.

Deputy Mayor Chris Thompson says there are also been damage to beach infrastructure.

"In front of the Mooloolaba Surf Club, they've lost their boat ramp onto the beach and the concrete beneath the lifeguard tower, so they've unbolted that and put it in the carpark just prior to the footings falling into the ocean," he said.

"There's severe erosion from Maroochydore to Alexandra Headland and severe erosion and scarping along the northern beaches."

Gold Coast beaches have also taken a pounding over recent days and will be closed again today.

Chief Lifeguard Warren Young says there are still a number of concerns.

"There's still some power in the swell there's still some debris in the water for sure," he said.

"Shark equipment's got to be cleaned up and Council's beach gangs will be working as well but still some debris, logs and still a strong swell and still water moving in close.