You can separate a mixture of sand and salt using evaporation. Here's how it works:

1. Dissolving: Salt dissolves in water, but sand does not.

2. Evaporation: Add water to the mixture and stir until the salt dissolves. Then, gently heat the mixture. The water will evaporate, leaving the sand behind.

3. Crystallization: The evaporated water can be collected and allowed to cool. As the water cools, the salt will crystallize out of the solution, leaving you with clean salt.

Let me know if you'd like to know about other methods!