The north of the Médoc coast, SW France, is a sandy coast with complex environment settings including an irregular bathymetry, shallow banks and rocky outcrops, and adjacent to a km-scale estuary. This coast is strongly affected by marine erosion and exhibits dramatic erosion trends, with shoreline retreats reaching locally several meters per year for decades. New coastal management scenarios for the next years, or even decades, need to be investigated. This will require the implementation and use of reduced-complexity shoreline change models. They are valuable tools to simulate past and future shoreline changes at time scales from seasons to centuries. These models usually rely on time and space integration of wave-driven longshore sediment transport, which is one of the main drivers of shoreline change along sandy coasts on the long-term. This longshore transport is computed from breaking wave conditions, which are controlled by several physical processes occurring within the nearshore area. However, the control of local environmental settings on breaking waves is usually over-simplified in reduced-complexity shoreline change models, if not neglected. This study investigates the sensitivity of the wave-driven longshore sediment transport along the north of the Médoc coast to different physical processes affecting the wave propagation. Results revealed that on a monthly scale the bathymetry and the bottom friction play a predominant role on longshore sediment transport patterns. In contrast, the contribution of tide-driven water levels is lower on this timescale, and even less for contribution of the tide-driven currents.< Réduire