Kim, who tied for fifth at this year's Open Championship, shot a blistering final round of 64 to finish the tournament on 13-under-par.
With almost all of Saturday's action at the Sentosa Golf Club cancelled due to torrential rain, tournament organisers were forced to cut the contest to just 54 holes.
And while Kim's strong finish suggests he could have posed a stern challenge had there been an additional day of competition, the 26-year-old was content with a fairly positive showing in Singapore.
"I'm pretty happy with the score," Kim said. "Looking at the board now, I'm disappointed with the bogey on the seventh where I hit the ball onto an unplayable lie on the par five.
"But I'm getting better every week and that's all I can ask for.
This weekend's strong showing continues an impressive run of form for Kim in Asia, after he finished third in Korea, before a runner-up finish in Shanghai.
Having been out of golf for six weeks, Kim is delighted to have hit the ground running, and has already set his sights on next week's Iskandar Johor Open.
"It's been good. I didn't know what to expect as far as my play - I took a month and a half off, didn't touch my clubs.
"Fortunately, I've been able to find my game and confidence and that's the biggest difference out here.
"I just have to keep playing and hope for more putts to drop. I had four three-putts this week, which is disappointing but the greens are tough.
"I'm looking forward to the Johor Iskandar Open."
Kim also admitted he understood why he failed to make the team for next week's Presidents Cup, having shown some indifferent form in the lead up to the prestigious team tournament.
"I wouldn't say not making the team is a setback - I am coming off an injury.
"My confidence and ball striking is down, my short game was terrible.
"I'm happy with the progress and hope that I can keep up the good play and hope my confidence will keep growing, and that I can make the next Ryder Cup and Presidents Cup teams."
Looking to the future, Kim is setting a top-50 berth as a reasonable target to reach by the end of the year, and is hopeful he can achieve it despite the fact that next week's tournament in Johor will be his last of the season.
"That [breaking into the top 50] is the goal. It seems to be happening.
"I just need to play better next week and hopefully have a chance to win. Johor will be my last event of the year."
Kim' last PGA Tour victory came at last year's Shell Houston Open when he beat compatriot Vaughn Taylor in a playoff.