You can lay some 5/8" sheathing boards down on the vapor barrier to get you where you need to be and protect your vapor barrier if it is just over sand.
keeping the humidity level and insects/rodents out are you biggest problem in a crawl space.
Just this year, one of the builders I work with had to replace a central support beam in a house with a crawl space. the vents were plugged and the dryer vent dumped into the crawl space. It was so damp that the wood below became wet and insects ate it apart, on top of the huge mold issue.


Make sure the ventilation is working and/or check the insulation if you are heating the space.

Congrats on the new house. Let us know what you are going to put in.