You could, but how deep would that compost/soil mix over straw be? Plant roots need soil not just to anchor them to the earth but also feed them and the depth of soil helps with both.
What you are describing is somewhat like Pat Lanza's Lasagna Gardening.

Here is a link that might be useful: Lasagna Gardening 101

If you don't want to dig - check out the link below. This man Don't dig, fertilize, spray, or even water! You should check his garden out!

Here is a link that might be useful: No Dig?

Certainly - the roots will penetrate into the sandy soil, through the layers, and you won't have to till that area at all.

Well Im also going to mulch the whole area with a top dressing of about 3-4 inches of chipped wood..Im well aware of not digging that into the soil due to the nitrogen suck in the breakdown of it...I feel pretty confident that as long as the compost is old enough and not hot that this will work..was just hoping someone had actually tried it to maybe share some tips and or results..thanks

This post was edited by haps on Sun, Mar 24, 13 at 17:08