  We propose the idea of "Earth Shielding" to reject cosmic-ray backgrounds, in
the search for boosted dark matter at surface neutrino detectors, resulting in
the enhancement of the signal-to-background ratio. The identification of
cosmic-originating rare signals, especially lacking features, at surface
detectors is often considered hopeless due to a vast amount of
cosmic-ray-induced background, hence underground experiments are better
motivated to avoid such a challenge. We claim that surface detectors can attain
remarkable sensitivities to even featureless signals, once restricting to
events coming through the Earth from the opposite side of the detector location
for the signals leaving appreciable tracks from which the source direction is
inferred. By doing so, potential backgrounds in the signal region of interest
can be substantially suppressed. To validate our claim, we study experimental
reaches at several surface experiments such as SBN Program (MicroBooNE, ICARUS,
and SBND) and ProtoDUNE for elastic boosted dark matter signatures stemming
from the Galactic Center. We provide a systematic discussion on maximizing
associated signal sensitivities.
