The key is how sandy is your soil really? “Sandy” is a scale from X percentage of sand to 100% sand. Have you had a soil sample done?
As Sticker says, if you have enough other soil components to hold some water, you may have good options. If you have almost “beach sand” soil, you’re going to have very few options.
I would agree with trying to use rye to build up the organic matter. I would also look at using a mow-n-throw technique to keep the thatch on top and preserve moisture.
Also, I would suggest trying to late summer plant clover or an alfalfa mix and then use a nurse crop of rye or oats to provide shade. Timing is going to be critical, you obviously only want to late summer plant if you are getting regular rain. If it’s a drought or dry, don’t plant.
Without a soil sample rating the % of sand, it’s tough. There are a lot of things you “could” try, but it’s shooting in the dark at this point without knowing how much sand is in your “sandy” soil.
Grouse