Das, who signed off with a tournament total of 13-under- 275 at the pristine Kensville Golf & Country Club, returned to winning ways after almost two years.
Noida's Amardip Sinh Malik finished a close second at 12 -under-276 having posted a fourth round score of one-under-71 at the Rs. 40 lakh event.
Delhi's Shamim Khan (68) and Chandigarh's Ajeetesh Sandhu (71) shared third place at nine-under-279.
Shankar (68-70-66-71), the overnight leader by one shot, outperformed his nearest rival Amardip to bag his seventh career title.
Shankar did have a few anxious moments at the end as he bogeyed the 16th and Malik birdied the 17th. Shankar was in trouble on the 18th as well after finding the bunker twice.
But the Kolkata golfer soaked in the pressure and managed to seal it with a creditable bogey on the last where Amardip missed a birdie by a whisker.
Das said, "This win is huge for me as I've won after a long gap. My family back home has been expecting me to win for a long time, especially my two kids. My victory will make them really happy," he said.
"I feel I'm getting back to where I was in 2014 when I won the PGTI Order of Merit. I now have loads of confidence heading into the next few events."
Amardip, who came up with three birdies and two bogeys in his final round, put up a stiff challenge against Shankar in the latter stages of the day.
Amardip said, "I'm gutted to not have won despite giving it my all. Nonetheless, I'll look to carry forward my good form from here on. I'm happy with the progress I've made with my golf swing. That's another big take-away from this week."
Shamim Khan, who was tied third, continues to lead the PGTI Order of Merit, while Ajeetesh Sandhu, who also took a share of third place at Kensville, moved up from third to second position in the money list.
Jamshedpur's Karan Taunk produced the best round of the tournament, a seven-under-65. He closed the week in tied 22nd place at one-over-289.
The two local amateurs, Varun Parikh (five-over-293) and Anshul Patel (17-over-305), were placed tied 32nd and 62nd respectively.
Disclaimer: No Business Standard Journalist was involved in creation of this content
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