Search for the Cabibbo-suppressed decays ${\mathrm{\Lambda }}_c^{+}\to {\mathrm{\Sigma }}^0{K}^{+}{\pi }^0$ and ${\mathrm{\Lambda }}_c^{+}\to {\mathrm{\Sigma }}^0{K}^{+}{\pi }^{+}{\pi }^{-}$

Utilizing 4.5 $f{b}^{-}$ of $e^{+}{e}^{-}$ annihilation data collected at center-of-mass energies ranging from 4599.53 MeV to 4698.82 MeV by the BESIII detector at the BEPCII collider, we search for the singly Cabibbo-suppressed hadronic decays ${\mathrm{\Lambda }}_c^{+}\to {\mathrm{\Sigma }}^0{K}^{+}{\pi }^0$ and ${\mathrm{\Lambda }}_c^{+}\to {\mathrm{\Sigma }}^0{K}^{+}{\pi }^{+}{\pi }^{-}$ with a single-tag method. No significant signals are observed for both decays. The upper limits on the branching fractions at the $90\mathrm{\%}$ confidence level are determined to be $5.0\times {10}^{-4}$ for ${\mathrm{\Lambda }}_c^{+}\to {\mathrm{\Sigma }}^0{K}^{+}{\pi }^0$ and $6.5\times {10}^{-4}$ for ${\mathrm{\Lambda }}_c^{+}\to {\mathrm{\Sigma }}^0{K}^{+}{\pi }^{+}{\pi }^{-}$.