The answer really requires a cubic measure - the volume - of the construction. 100 square feet can be covered to a depth of only a grain of sand or several inches (or more) of sand and, obviously, the quantity of sand required will vary accordingly.
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220 square feet
10,763.9 square feet.
1,205.56 square feet.
More information is required. If you want to convert it to SI units, or to square feet, or something, say so. If you want to have a general idea, to visualize how big or small that is, then say so, too.