According to #Pitataufatofua from #Tonga you can!!! He trained on the sandy beaches of Tonga, and skied for only 21 days before qualifying for the #Winter-Olympics in 2018!
What made his ski-conditioning workout so effective? He was constantly training his muscles for the “change-in-direction” that skiing requires. Sand is perfect for helping you improve your turns. Since it is an unstable or unpredictable surface, it allows you to practice a “surprise element” similar to what you get from the snow when you’re turning your skis.
So, the beach adapts remarkably well to ski conditioning.