"swim beach" is correct and usable in written English.
You can use it when referring to a beach where swimming is allowed. For example: "The swim beach was the perfect place to cool off on a hot summer day."
In a neatly subdivided park, office workers on lunch break napped in the shade, and along the waterfront boulevard, couples and families — mostly Indians, the women in stunning yellow, orange and teal saris, along with a smattering of French tourists — ambled past the too-rocky-to-swim beach, the stately Hôtel de Ville and a statue of Gandhi.
Hotels, a swimming beach, and entertainment places serve the tourist industry.
Skin-divers are not permitted on any local public swimming beach.
A town of Huntington swimming beach on Cold Spring Harbor, open to all town residents, is adjacent to a larger village swimming beach for village residents only.
Despite stormy Bass Strait, Boat Harbour is a safe swimming beach.
Low tide reveals mud flats, but it's a short amble to a fine swimming beach.
So will the West End 2 ocean swimming beach, which had attendance of about 10,000 last summer.
Jacob Riis Park has a mile-long swimming beach and a 72-acre parking lot.
The surrounding state park includes miles of trails, tent and trailer sites, showers, cabins, and a swimming beach.
