“Project Runway” star HEIDI KLUM’s hush-hush plot – finding BFF SANDRA BULLOCK a good man!

The “Blind Side” Oscar winner and the supermodel have been close pals for years, but they recently bonded over their shared new status as divorced single moms, sources say.

“Heidi’s been trying to hook Sandra up with a guy for a while, but Sandra’s always laughed off her matchmaking plans – until now,” a source told The ENQUIRER.

When the two women met up at the People’s Choice Awards on Jan. 9, Heidi broached the topic once again, and this time Sandra gave in. But she did lay some ground rules – no actors and absolutely NO tattooed bikers!

Heidi was ecstatic,” said the source. “She admitted that she has already compiled a list of her eligible bachelor friends, and they were all anxious to meet Sandra.”

The 48-year-old “Miss Con­geniality” actress, who’s been raising adopted son Louis, 3, alone, hasn’t dated anyone seri­ously since splitting from her cheating ex-hubby, the heavily tatted Jesse James, in 2010.

Now, says the source, Sandra and Heidi are having a blast going over her potential suitors.

“Sandra would never let anyone other than Heidi try to fix her up,” the source added. “She refuses to go on a blind date, so Heidi’s plan is to have small, informal gatherings with ALL their kids running around.

 “Heidi feels that the man for Sandra needs to be strong, flexible and be able to deal with anything — and if the poor guy can deal with a houseful of kids and still catch Sandra’s attention, then it’s a match made in heaven!”