Sand dunes signify your own longing for protection and shelter from the elements. If you have this particular dream, you need to determine what you need protection from and how you can feel protected. Sand moves and, therefore, is volatile. (read all at source)
climbing sand dunes dream interpretations
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While sand itself can be an adverse dream, sand dunes are a different matter altogether. A sand dune represents protection as these are protected from distraction by law and this dream shows that you are longing for, or actively seeking, protection in your life. (read all at source)
To see a sand dune in your dream, signifies your desires to be sheltered from the bitterness of reality.
To see sandpaper in your dream, suggests that you need to smooth over some rough spots in your situation or relationship. (read all at source)