The group are the final act added to the event, which takes place in Pembrey Country Park, Wales between June 14 - 18.
Watch a trailer for the official announcement below:
They will perform alongside previously confirmed acts Labrinth, Dizzee Rascal, Dry The River, Friendly Fires, Maverick Sabre, Delilah and Ben Howard.
Tickets for Beach Break Live are on sale now and start at £109, with festival-goers able to book their place with a £40 deposit.
Last year's event saw performances from Tinie Tempah, Professor Green, Katy B, White Lies and Ed Sheeran.
Watch the music video for The Maccabees' 'Pelican' below: