I got your sand glider right here! The desert locust.
source for image
These are big desert insects. They can flap. But once they get going they also glide.
OBSERVATIONS ON GLIDING IN THE DESERT LOCUST. J Roffey et al, Animal Behaviour, 11 1963, pp. 359-366
Gliding has been observed frequently in adults of the Desert Locust,
Schistocerca gregaria. It occurs regularly amongst locusts
descending to the ground from their overnight roosting positions in
vegetation and on a number of occasions dense concentrations of
adults at the leading edge of and within intermittently settling or
"rolling" swarms have been seen to descend to the ground by
The duration of individual spells of gliding was very variable.
Whereas the locusts at Bulo Burti were gliding continuously,
conceivably for hours, the duration of glides in the other
observations ranged from 5 to 60 seconds, the bursts of gliding
alternating with bursts of flapping flight. Even during the longer
bursts of gliding the locusts were not obviously losing height, and
gliding did not lead to settling, although this has been observed on
other occasions. On the other hand, the locusts were not obviously
gaining height, although Rainey (1958) has provided evidence that
this can occur in the field.
Gliding helps them move rapidly across the sand as suggested in the OP, although they don't run on the sand then jump up and glide. They flap then glide once up to speed. Gliding is used for the cross ground "rolling" movement of swarms which I think is close to what the OP envisioned. Gliding is also key for long distance travel of swarms - gliding insects can catch thermals, rise to altitude and cross great distances with a minimum of effort. Even across the Atlantic!