Das and Shamim finished with a four-day aggregate of nine-under 279 and six-under 282 respectively at the Kurmitola Golf Club.
Playing at his home course, Bangladesh's Md Siddikur Rahman lived up to the expectations of the home crowd as he recorded a four-shot victory here.
Siddikur fired a final round of two-under-70 to end the week with a total of 14-under-274.
Sweden's Malcolm Kokocinski (67) finished a distant second at 10-under-278 at the event tri-sanctioned by the Asian Development Tour (ADT), Professional Golf Tour of India (PGTI) and Bangladesh Professional Golfers Association (BPGA).
The 33-year-old was in no mood to yield an inch to his rivals from the very start as was evident from his three birdies over the first 10 holes.
Siddikur, who was in the lead since round two, did suffer a couple of setbacks with bogeys on the 11th and 13th but was solid through the final stretch, thanks to a birdie and four pars on the last five holes that saw him sail home with a comfortable margin.
Siddikur, a two-time Asian Tour winner, said, "I was really hungry for a win this week. I'm delighted that I could live up to the expectations of the fans here in Bangladesh.
"My putting form was back today as I sank some long putts including a 15-footer on the ninth and a 35-footer on the 10th. Those two putts really lifted my confidence. I had a great week with the putter and made a lot of long putts except for the third round.
Malcolm Kokocinski (70-70-71-67) posted the day's best score of five-under-67 to rise from overnight tied third to second place.
The Swede registered six birdies and a bogey on Saturday. He enjoyed a run of four straight birdies from the 11th to the 14th.
Bangladesh's Akbar Hossain (70) finished at 11-under 281 in the fourth.
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