Are you aware of your cells (as in, the individual cells, not "my cells" as a concept)?

Are your cells aware of you (as in, the you that is contemplating these questions, not the adjacent cells that make up part of you)?

For me, the answer to the first is no, and I strongly suspect the answer to the second is also no.

So I don't believe that the grains of sand would be aware. But it is possible that "entity comprised of sand granules" is aware, just as "entity comprised of carbon-based cells" is aware.