Played alongside the Aberdeen Standard Investments Scottish Open, the 36 hole event featured ten players from the World Rankings for Golfers with Disability taking each other on over the same layout the European Tour field are tackling in the third Rolex Series event of the season.
Lawlor carded a 77 on day one but followed it with the lowest round of the event by three shots to finish at six over, one shot clear of World Number One George Groves.
The Irishman won the G-Golf Knockout against Adem Wahbi at the Belgian Knockout and that has earned him a place in the field for the KPMG Trophy on the European Challenge Tour in August.
The World Number Three plays off scratch and has Ellis-Van Creveld syndrome, a disability characterised by a shorter stature and shorter limbs.
"It feels great," he said. "Today everything clicked, I smoothed it of the tee, I didn't miss many fairways and the putts dropped when I needed them to drop. I had a few bogeys coming in but we'll put that down to a wee bit of nerves."
He added: "Everyone out here are unbelievable payers and it's great to showcase it. To be out here this week competing with all the pros and having the chance to play off the same tees, it's a privilege for all of us.
"To play in such a fantastic event, it's an amazing achievement for EDGA to get us in and for the European Tour to accept that disability golfers are talented is fantastic as well. Inclusion is everything in the world and it's fantastic to be accepted.
"For so many professional golfers to accept what we're doing and accept that we can play with them, it's fantastic. They can see our talent and that's helping too."
Lawlor started the day three shots behind Groves but was brilliant on the front nine, birdieing the fourth, fifth and seventh to lead by one at turn despite dropping a shot on the ninth.
Groves - who has a paralysis of the left arm called Erb's Palsy - made gains of his own on the first and seventh but dropped shots on the second, third, sixth and eighth, and further bogeys on the tenth and 11th left the Englishman two behind, with Lawlor also bogeying the 11th.
Lawlor dropped a shot on the 13th but moved back two ahead as he picked it straight back up on the next.
A bogey on the 17th then set up a tense finish but Groves parred his final seven holes to leave Lawlor holding the trophy.
England's Mike Browne finished at 11 over, six shots clear of American Christopher Biggins and eight ahead of Australian Shane Luke.
Another Australian in Geoff Nicholas, Swede Joakim Björkman, Belgian Wahbi, local favourite Paul Ellison and South African Reinard Schuhknect completed the field.
The EDGA Scottish Open is the first of two disability championships scheduled alongside Rolex Series events on the 2019 Race to Dubai, with the 36 hole EDGA Dubai Finale due to feature as part of the season ending DP World Tour Championship, Dubai at Jumeirah Golf Estates in November.
With both the European Tour and EDGA (European Disabled Golf Association) striving to create a lasting legacy through the event, EDGA is offering free golf lessons with professional coaches to spectators with a disability throughout the week in East Lothian.