People who collect sand as a hobby are known as arenophiles or psammofiles.
Webster’s

I started collecting sand from my trips a few years ago but never knew there were names for the activity until recently (arenophile or psammofile sounds more like a medical condition than just having fun saving sand). Here are my top ten favorite sand locations, chosen for the color and texture of the sand:

1.  Ipanema Beach, Rio, Brazil
2.  Hapuna Beach, Kona, Hawaii
3.  Marble, Colorado
4.  Blue Lake, near Rotorua, New Zealand
5.  Coronado Beach, San Diego, California
6.  Cascais, near Lisbon, Portugal
7.  Santorini, Greece
8.  Erfoud, Morocco
9.  Sumner Beach, Christchurch, New Zealand
10. Manly Beach, near Sydney, Australia