As usual, it's advisable to be aware of the sand rules before visiting your preferred location. According to NJ.com, here are a list of beaches and their rules:

Barnegat Light - There are no rules against tents or canopies in Barnegat Light.

Bay Head - There are no rules against tents or canopies in Bay Head.

Beach Haven - Allowed: “Sunshades” that do not have grounding lines, ropes or sides, baby tents smaller than 40 inches by 40 inches by 40 inches.
Not Allowed: Pop-up tents without a special events permit.

Brick - Allowed: Umbrellas.
Not Allowed: Any tents with more than two sides obstructed and any structure supported by ropes or stakes.

Island Beach State Park - only single pole umbrellas and a maximum of 3'x3'x3' shade shelter for small children are allowed.

Lavallette - Allowed: Umbrellas, “baby tents,” canopy-style sunshades smaller than 10′x10′ without walls or screens.
Not Allowed: Any canopies or tents with walls or screens, or cabanas.

Ortley Beach - Allowed: Umbrellas, baby tents, canopy chairs and playpens.
Not Allowed: Large tents or canopies.

Seaside Heights - Allowed: Umbrellas, baby tents, canopy style sun shades, “sport-brellas.”
Not Allowed: Tents, tarps, canopies larger than 12 feet by 12 feet, canopies with walls or screens, cabanas or pavilions.

Seaside Park - Allowed: Umbrellas, baby tents, canopy style sun shades, “sport-brellas.”
Not Allowed: Tents, tarps, canopies larger than 12 feet by 12 feet, canopies with walls or screens, cabanas or pavilions.