I don't own one, but I've been doing a lot of research recently hoping to upgrade, so I can probably help.
Short answer- Yes (with some caveats)
Dry sand-- should be just fine, operate as normal
Wet sand-- expect to lose some depth
I read that it has a "Salt" setting that's designed help with some of the typical problems created by wet salty beaches (falsing, mineralization, reduced depth). Can't speak for how effective that setting is, but the machine does have good ratings and I read several positive reviews of people who use it at the beach.
It is NOT designed for diving, so be extra careful not to dip that control box in a wave or bye-bye MXT.