I have used those Exped Snow and Sand anchors on snow but not on sand.
On snow they work if you can dig them out the next morning..
On sand you may need to dig down to wet sand or fill them with stones and than bury them.
You could try first with a cheap or damaged stuff sack to see if it works for you.
I will try them in my sand filled (not on purpose) garden later on...
http://i43.photobucket.com/albums/e389/ ... anchor.jpgwell, it works.
I dug one foot down , filled the bag with sand , attached a guyline filled the hole, stomped on it .
I could not pull it out using the same force I pull a snow peg out with.
The 30cm depth was carefully chosen because it looked about right to me.
Franco