What parts of your foot are exposed in sandals? What is the temperature of snow? Is it safe to have #1 directly exposed to something that is #2?
Sandal
Sandals have open toes and don't completely cover the feet. Snow is very cold and direct exposure to skin can cause hypothermia. The feet need to be completely covered to walk through snow safely.
Type of footwear with an open upper
Is it safe to wear sandals in snow?