We study theoretically the impact of disorder on magnon properties and thermal Hall transport in a two-dimensional honeycomb ferromagnet with sublattice-inequivalent Dzyaloshinskii-Moriya interactions. Using the Holstein-Primakoff transformation and the $T$-matrix approximation, we compute disorder-averaged Green's functions, spectral functions, and the thermal Hall conductivity ${\kappa }_{xy}$. Disorder scattering induces sublattice-selective resonant states and midgap states inside the magnon gap. At low temperatures, ${\kappa }_{xy}$ exhibits a sign reversal that is enhanced by increasing disorder concentration and sublattice occupation asymmetry, originating from the self-energy induced spectral broadening of the magnon bands.

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• Magnons
• Spintronics
• Thermal conductivity
• Thermal transport