Depending on the type, a cubic foot of sand can weigh anywhere from 90 to 130 pounds. Assuming that the sand is normal and dry, it would weigh about 100 pounds per cubic foot.
There are different kinds of sand, and each has its own specific gravity. Different types of sand with the same volume would weigh different amounts because their specific gravities vary. For example, wet sand weighs about 120 lb. per cubic foot and has a specific gravity of 1.92, while dry sand weighs about 100 lb. per cubic foot and has a specific gravity of 1.60.