I see Rohling et al. (2009) model for RSL but I cannot extract data from paper. Please guide me where can I obtain this data? Orhow can extract my required data?
It is not possible to establish global sea level without a reliable static datum. The crust is moving all the time because of changes in isostatic equilibrium that vary from place to place. Think of a geoid wobble model constrained by total solid volume. The oceans are simply a passenger sitting on that model.
It hard to have one global model as you mean. But for Sunda Shelf you could use model from the following publication, Sathiamurthy & Voris (2006) or Solihuddin (2014).
I had a quick look at the Sathiamurthy & Voris paper which concludes that:
"At 22 ka BP, prior to the terminal stage of the LGM, which started at 21 ka BP, sea level was at -116 m below present -day MSL."
It is likely that LGM ice/water relationship had a very negligible effect on Relative Sea Level on the Sunda Shelf compared with local isostatic depression due to sediment loading. Changes in topography were a consequence of uplift caused by intermittent subduction along the island chain causing mountains to rise, erosion, runoff and deposition on the shelf, which was depressed by the incremental sediment load there. Those changes were intermittent in time and space and it would require dated stratigraphy of Holocene age cored sediments to unravel the local sequence of events. Present seabed and land topography is completely irrelevant to the solution of your problem and eustasy is an unnecessary distraction.