The farther we look into the universe with telescopes like Hubble and others, the more galaxies we see.
I read a very interesting fact in an astronomy magazine recently that said it is estimated that if you hold your thumb out at arms length, close one eye and look at the top of your thumb nail, you are covering up an estimated 240,000 galaxies with your thumb regardless of what direction you look!!!!!!
Each galaxy might have an average of 100 to 200 billion stars in them!
I have no idea for the estimate of sand grains on every beach in the world-maybe that would be a good question to ask separately in the geography section - but I'm positive that there are quite a bit more stars than sand grains.