Do you have a PTA or PTO, etc? If you do and are a member, you could attend a meeting and ask about ratio of supervisors to kids or is the play area broken down into areas for supervisors to watch. Just bring it up nicely under "new business". Other parents probably would join in since it can be a safety issue.
We spread our aides around the perimeters of the playground, one in the middle to oversee games, & one walking around the whole playground. We don't have a sandbox, we have a big slide. One of the perimeter aides stands by the slide and mainly oversees the slide. Maybe suggest having someone stand by the sandbox.
Are there older kids on the playground that can volunteer to be playground helpers? We use the 5th graders. They normally are eating when we are on the playground. The principal has a rotating schedule of blocks of 6 fifth graders. They are the 1st to get their lunch, they eat, and come right outside to volunteer to referee games, etc. for us. The younger kids love it & listen better to the older peers. The 5th graders like it because they have someone looking up to them. School counselor likes it because it builds self esteem within the 5th graders.
