Unless your child’s preschool has special footwear rules, there’s no reason why they can’t wear supportive sandals there. In the case of a no-sandals policy, it's best to send your child to school wearing socks and shoes that protect their feet throughout the day. If your child does wear sandals to preschool, they should be closed-toe and supportive enough for all-day play (in other words, flip flops are a no-no).