Abstract Landfall reorganizes the tropical cyclone eyewall boundary layer (BL) through elevated surface roughness and reduced enthalpy fluxes. Using a 100‐m resolution nested large‐eddy simulation of Typhoon Hato (2017), we compare eyewall BL structures before and during landfall. Kilometer‐scale rolls and streaks dominate variance and vertical fluxes in both stages, but become shallower and less vertically coherent during landfall, redistributing turbulent transport toward lower levels. Flux decomposition reveals that while tangential momentum flux weakens, low‐level radial momentum flux is enhanced by its large‐scale component. Simultaneously, increased stability near the mixed‐layer top strengthens coupling between vertical velocity and thermodynamic perturbations, indicating a wave‐like response superimposed on residual turbulence. Cross‐scale diagnostics show that the modulation of sub‐kilometer turbulence by kilometer‐scale coherent motions becomes vertically compressed and increasingly confined to the lower BL. These results highlight how landfall‐induced surface forcing modifies multi‐scale turbulent organization, enhancing our understanding of landfalling typhoon dynamics.