With results from AGCM experiments with various prescribed boundary conditions, we further examine the relative role of enhanced land-sea thermal contrast, and SST anomaly in local and remote oceanic basins in contributing to the SAM climate change. We find that, the enhanced land-sea thermal contrast acts to displace the precipitation pattern northward, leading to enhanced SAM rainfall over land and reduced rainfall further south. Warmer Sea Surface Temperature (SST) in northern Indian Ocean is crucial in contributing to the enhanced SAM rainfall. To obtain the climate change of SAM rainfall magnitude and circulation projected by the GFDL coupled simulation, however, the influences of SST Anomaly in other tropical oceanic basins must also be considered. A mechanism on how the El Niņo like climate change in tropical Pacific affects the SAM region has been proposed. Finally, given the dependence of climate change model simulations on representation of physical processes therein, we discuss the general application of our findings to climate change simulations provided by other coupled atmosphere-ocean models.