The plebs can pound sand!

An exclusive indoor sandpit has opened up on Manhattan’s monied Upper East Side — so the offspring of New York City’s elite don’t have to play in the rat-infested boxes open to the general public.

Urban Dunes — which bills itself as “NYC’s Only Indoor Sandbox” — offers three “Sandventure” rooms, where kids can play for 90 minutes for the price of $30.

The room-sized sandpits — Dino Land, Golden Beach, and Construction Zone — also have their own themed toys, so no germs can hitchhike on outside toys and infect their immaculately-maintained “natural sand.”

“I hate when they go into the public sandboxes,” said Upper East Side mom Natalie Barzilai.

“I don’t stop them, but I hate it. When I walked in, I really thought about that — this is a great idea. They ge

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