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Red sand dunes occur in the coastal plains of south east and west of Tamil Nadu, India between the coordinates of 8A degrees 00’ to 9A degrees 30’ N; 77A degrees 18’ to 79A degrees 00’ E. OSL dating of these sands indicated aggradations between similar to 16-9 ka and similar to 9-3 ka in the west and east coasts respectively. Dating results from inland red dunes at the foothills of Western Ghats show a break in deposition at similar to 6 ka and aggradation since similar to 2 ka. The sand aggradations in the west coast occurred during the transition period when SW monsoon in the area was reestablishing. The dunes attained their stability by 9 ka. In the coastal region, the aggradations were controlled by sea level changes and a local recycling of earlier dunes (in the east coast). In the inland areas, the dune building was controlled by sand supply from fluvial sources.