is a Hopi
(US southwest) representation of a serpent eating its tail.
Thanks to Kristin Klossner for suggesting this is probably
a Hopi symbol. Because this is a modern interpretation on
wood, this sand painting is probably a 'mock' painting with
slightly altered symbolism that does not include the more
sacred and unviewable power symbols that would be inappropriate
for the ritually-unprepared to view.
(Please let me
know if you know a precise derivation of this piece.)