Easiest way to find out is to do an experiment with your particular sand.
Either NaOH (bar) soap or KOH (liquid) soap is fine, but it has to be really truly lye-based soap not a syndet cleanser. And ~distilled~ water is important too -- don't use water from the tap even if it goes through a filter. The soap and water mix should be clear pretty much like plain water.
Stir some of your maple sugar sand into the soapy water and let it sit long enough so any undissolved solids have time to settle out. If the soapy water is remains clear, the dissolved portion of the maples sugar sand hasn't reacted with the soap. If the water becomes cloudy, the sand has reacted with the soap.