Law topped the leaderboard at Lumine Golf, where Ross Kellett also progressed, while Grant Forrest, Bradley Neil and Peter Whiteford all qualified at Las Colinas.
Law, who finished top Scot in last year’s final stage in 37th, is heading back to the PGA Catalunya resort outside Girona in fine fettle.
Taking up where he’d left off in his final Challenge Tour event of the season, the two-time Scottish Amateur champion was close to the top of the leaderboard in all four rounds.
He was two-under with two to play in the final circuit before dropping his only shot of the day, closing with a 70 for a 12-under-par 272 total to finish a shot ahead of England’s Robert Coles (69).
“I’m really pleased with this week,” admitted Law. “I’ve been playing well recently and hoping to continue that into finals.
“I came close there last year so hopefully I can draw on that experience and gain a card time around.”
Kellett was just as impressive as Law as he finished joint-fourth at the Tarragona venue, signing off with a 70 as well for 274. “I was very solid all week with not many mistakes,” said the Motherwell man. “In fact, I only missed six or seven greens in 72 holes.”
Forrest maintained an impressive start to his professional career by finishing fifth at Las Colinas in Alicante, where Neil and Whiteford also made it through in ninth and 13th respectively.
Following a closing 67 for an eight-under-par 276, Forrest will pay his first visit to the marathon six-round final, which starts on Saturday, feeling quietly confident, as will Neil after he signed for an eagle and five birdies in a last-day 66.
Whiteford, who is bidding to regain the card he held for five years before losing it at the end of the 2014 season, finished with a flourish with four birdies in the last five holes for a 67 as he jumped up 13 spots.
The quintet’s success means that a total of seven Scots will be among the hopefuls bidding to finish in the top 25 at the final on this occasion.
Craig Lee is back there for the first time since 2010 after the Stirling man agonisingly came up one spot short of retaining his playing rights in this season’s Race to Dubai.
Scott Henry, meanwhile, also enters the card scramble at the last stage through making it to the Challenge Tour Grand Final.
Despite a closing 69, Ewen Ferguson came up two shots short at El Saler, while Jack Doherty, in 45th, finished best of the Scots at Panoramica, where the qualifiers included Brooks Koepka’s little brother, Chase, after he closed with a 68.