I love Sin too! And I consider myself something of a drugstore expert, but I'm a little bit stumped here.
The closest dupe I could find is the light sandy shade in the Wet N Wild Paradise Cove palette,
here(top right of the palette). It's a little bit more beige than Sin, but it's quite beautiful, and I would say the finish is kind of similar, in being very shimmery but not too frosty or anything.
There are swatches for that
here.
There was also the same palette in
Sand Castle with more colors like that, I don't have that one but it might work out. There are swatches for that
here - number 4 looks pretty close!
Good luck!