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We present a measurement of the time-dependent $CP$-violating
asymmetry in $B^0 \to K^{*}_0\gamma$ decays with $K^{*}_0\to
K^{0}_s\pi^0$ based on 232 million $\Upsilon(4\mathrm{S})\to B\bar{B}$
decays collected with the BaBar detector at the PEP-II
asymmetric-energy $e^{+}e^{-}$ collider at SLAC. In a sample
containing $157\pm 16$ signal decays, we measure $S_{K^{*}_0\gamma} =
-0.21 \pm 0.40 \pm 0.05$ and $C_{K^{*}_0\gamma}= -0.40 \pm 0.23 \pm
0.03$, where the first error is statistical and the second
systematic. We also explore $B^0 \to K^{0}_s\pi^0\gamma$ decays with
$1.1
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