Sandhu (70-67-73-63), lying a lowly 17th, five shots off the lead, after the penultimate round, literally pulled a rabbit out of the hat on day four as he fired a dazzling eight-under-63 to take his total to 11-under-273 and as a result earn his place in the playoff against Bengaluru's Khalin Joshi (65-70-70-68) in the second event of the 2017 PGTI season.
Joshi, the overnight joint leader, posted a three-under-68 in the final round.
Ajeetesh, who refreshed memories of his victory last year, took home the winner's cheque worth Rs. 6 lakh to emerge as the PGTI Order of Merit leader.
Sandhu didn't have the best start to the day as he struggled on the first three holes. He found the water on the third where he dropped a bogey.
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The turnaround for the 28-year-old began from the fourth where he drained a 25-footer for birdie. From there on, he went on to add an eagle and six more birdies to match the tournament's best single-round score achieved earlier in the week by Pune's Sameer M Shaikh.
The wiry Chandigarh lad also drove the green on the 15th and rolled in a 25-footer on the 16th that contributed towards his hat-trick of birdies in the closing stages.
Sandhu, composed as ever, despite his sensational win, said, "I'm enjoying a terrific start to the season. This win comes after a good performance in Noida last week where I finished tied third. The HGC is turning out to be one of my favourite courses. Interestingly, I had missed the cut in the first edition. To follow that up with wins in the next two editions is quite incredible.
"It was a good putting day for me, unlike the previous rounds. But the stretch on the 14th and 15th was a poor one for me. I lot some momentum there. Nonetheless, I've relished the playing conditions here at the HGC and look forward to coming back next year," Khalin said.
Delhi's Himmat Singh Rai, the overnight joint leader, slipped to tied 13th at three-under-281 after a final round of 76. Harendra Gupta (71) of Chandigarh, the 2015 champion, also took a share of 13th place.
Interestingly, the trophy was won by a Chandigarh golfer for the third time as Ajeetesh's city-mate Harendra Gupta had won the first edition two years back.