  Owing to its low electronic noise and flexible target materials, the
Spherical Proportional Counter (SPC) with a single electron detection threshold
can be utilized to search for sub-GeV dark matter (DM). In this work, we
investigate the prospects for light DM direct detection through the DM-nucleus
Migdal effect in the DARKSPHERE detector. We consider the different DM velocity
distributions and momentum-transfer effects. For Xenon and Neon targets, we
find that the DM mass $m_{DM}$ can be probed down to as low as $m_{DM} \sim
\mathcal{O}$(10) MeV, and the derived bounds on the DM-nucleus scattering cross
section $\bar{\sigma}_{n}$ are sensitive to the high-velocity tails of the DM
velocity distribution, which can be altered by orders of magnitude for the
different DM velocity distributions in the region $m_{DM} < 10$ MeV.
