  We investigate the possibility of using the Short-Baseline Near Detector
(SBND) at Fermilab to constrain lepton flavor violating decays of pions and
kaons. We study how to leverage SBND-PRISM, the use of the neutrino beam
angular spread to mitigate systematic uncertainties, to enhance this analysis.
We show that SBND-PRISM can put stringent limits on the flavor violating
branching ratios $\rm{BR}(\pi^+ \to \mu^+ \nu_e) = 8.9 \times 10^{-4}$,
$\rm{BR}(K^+ \to \mu^+ \nu_e) = 3.2 \times 10^{-3}$, improving previous
constraints by factors 9 and 1.25, respectively. We also estimate the
SBND-PRISM sensitivity to lepton number violating decays, $\rm{BR}(\pi^+ \to
\mu^+ \overline{\nu}_e)= 2.1 \times 10^{-3}$ and $\rm{BR}(K^+ \to \mu^+
\overline{\nu}_e) = 7.4 \times 10^{-3}$, though not reaching previous BEBC
limits. Last, we identify several ways how the SBND collaboration could improve
this analysis.
