Don't go onto the Sand
Having graduated a group of students hit the beach for a massive party and now it is the morning after and they wake up to find themselves scattered about; some are in the lifeguard tower, others are sleeping on benches and some are in a car. But they soon discover that they are all trapped as anything which a pulse which touches the sand gets painfully digested by it.
I reckon out of the thousands of movies that I have watched and reviewed some which in truth are poor have been saved by some nifty ideas. Whilst the nifty ideas in "The Sand" don't save it they at least make it watchable. Take the party, one of the guys gets everyone to put their phones in the trunk of his car so that no one makes a drunk call or sends a drunk text which of course leaves them unable to reach them to call for help when they find themselves trapped.
The trouble is that "The Sand" ends up coming across as a movie which had limited funds and used them for some set piece scenes such as when one of these students unknowing steps on the sand and we get to see his face being eaten off. In between those effect driven scenes of horror what you have left is actors stuck where they are doing a lot of moaning and blaming each other. And whilst the acting isn't the worst I have come across neither is it the best and so these scenes do not keep you completely immersed in this horror situation.
What this all boils down to is that "The Sand" ends up one of those horror movies which has some half decent ideas but not enough to string them together into a decent movie.