Proper off-roading is an art that takes time and lots of experience to master. But of all the environments any adventurer can encounter on the trail, sand can be one of the trickiest and most complex.

To introduce the sport of off-roading to a new generation, Keri Shea, 45, of Massapequa, is driving on the sand this season with her 6-year-old nephew, Monti. Sitting in a child safety seat in the ...