My preference for driving on sand is an all-terrain tread. Mud-terrain treads will work and in some cases are better; as long as the sand is damp. However, in dry, loose sand, the MTs tend to dig holes.

The key with tires is not so much tread style but tire pressure and tire width.

With lower tire pressure, you distribute the weight of the vehicle over a broader area and tend to ride on top of the sand without digging in.

The wider the tire, the broader area of contact with sand which helps keep the vehicle from digging into the sand.

So, wide tire and low tire pressure.