The Maritime Continent (MC) has experienced significant anthropogenic land use changes, mainly deforestation, which has led to local surface warming and marked convergence in the lower troposphere and divergence in the upper. The remote consequences of this deforestation remain unclear and present considerable uncertainties. In this study, we employ a fully coupled climate model and a linear baroclinic model to explore the effects of altered land‐atmosphere interactions due to MC deforestation on high‐latitude climates. Our series of idealized experiments demonstrates that MC deforestation can induce upper‐level diabatic heating. This generates a barotropic Rossby wave that moves poleward, drawing energy from the subtropical jet across the Central to Eastern Pacific regions via eddy‐mean flow interactions. Such interactions amplify the Aleutian Low, promoting the northward transport of warm air, leading to notable warming anomalies. This influx of warmth contributes to sea ice melt, initiating a positive ice‐albedo feedback. A lapse‐rate feedback is also observed in adjacent high‐latitude land areas, amplifying terrestrial warming. These reinforcing feedbacks, combined with the direct temperature transport enabled by the strengthened Aleutian Low, cumulatively result in pronounced high‐latitude warming originally due to the tropical land use changes. Plain Language Summary Deforestation in the Maritime Continent (MC) has far‐reaching implications, extending to remote climatic areas. This study explores the mechanisms by which deforestation in the MC impacts climates in middle‐to‐high latitudes, especially during the boreal winter. The deforestation effect originates from the MC, traveling along the subtropical jet. The interactions between localized and larger‐scale atmospheric flows play a pivotal role in this transmission. These interactions bolster the Aleutian Low during winter, resulting in the warming of the Bering Sea. This warming results from the direct transport of warm air, facilitated by the intensified Aleutian Low and feedback loops enhanced by the ice albedo feedback and changes in radiations. Our idealized experiments show that MC deforestation can strengthen the Aleutian Low and lead to a warmer Bering Sea in the winter. Key Points Deforestation in the Maritime Continent triggers a chain reaction in winter Rossby wave dynamics and strengthens the Aleutian Low The intensified Aleutian Low transports warm air from lower latitudes to the Bering Sea region, resulting in significant low‐level warming Local lapse rate changes and ice‐albedo feedback jointly enhance low‐level warming