I don't know what you are using for substrate now but if you are just looking for something new for the sake of enrichment (which I think is a great idea) I would actually suggest things like Carefresh, aspen, newspaper, or cypress mulch over sand. All of those are good substrates and, if put into some kind of rotation, could provide a variety of scents and textures for the snake. All of them are easier to work with than sand as well.
If, on the other hand, you are looking for a specific look (as in a naturalistic vivarium) than I think sand can be used if the concerns mentioned my previous post are addressed. Just keep in mind that sand is heavy and not particularly easy to keep clean.
Just some more food for thought.
Rob
>>Thanks for such an in-depth answer Rob, it was all very useful. I thought it might make a nice change for my snake, give her something new to explore etc.
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>>It's not something I'm going to rush into but the more info I have the better!
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>>Thanks again