The Giants passed on Isaiah Simmons in the 2020 draft, instead taking Andrew Thomas.

On Thursday, they added Simmons to their roster at last.

General manager Joe Schoen sent a seventh-round pick to Arizona for Simmons, taking a flier on a player once seen as a high-end prospect in the hopes that the Giants can revitalize his career.

ESPN’s Adam Schefter first reported the news.

Simmons, the eighth-overall pick in 2020, was seen as one of the better athletes in that draft, but his value has since dropped because he doesn’t have a firm position between safety and linebacker.

Last year, the Cardinals played him mostly as a slot cornerback, but Simmons also had 297 snaps as a box defender and 110 on the defensive line, with a handful as a wide cornerback and free safety, per Pro Football Focus.

On the Giants, Simmons figures to slot into the same safety/linebacker hybrid role that Landon Collins and Tony Jefferson have played in the past.

There could also be opportunities for Simmons as a pass rusher in defensive coordinator Wink Martindale’s system.

“It’s obviously pretty early; Joe’s done a good job with his staff of, again, just evaluating and keeping conversations open about a number of players, him being one of them,” coach Brian Daboll said. “He’s almost 6-[foot]-4, around 240 [pounds], explosive, high pick.”

Simmons, he said, could arrive at the team’s facility as soon as Friday. Though he wasn’t expansive on where Simmons will go in the defense, Daboll did say that he has “multiple role potential, but we gotta see it.”

In 13 games last season, Simmons had two interceptions and 99 tackles. But with Nick Rallis replacing Vance Joseph as Arizona’s defensive coordinator, a fresh start was in the cards for Simmons.

“With all these decisions, it’s a culmination,” Cardinals GM Mossi Ossenfort told reporters. “We won’t make a snap judgment on one game, one play or anything like that. It’s a culmination of since we all got here in the spring, in camp and a decision we came to, not a reaction.”

It is a fairly low-risk move for the Giants, particularly given that Simmons carries just a $1.01 million cap hit and is in a contract year. He is also durable, with zero games missed over three seasons in the league.

And he has already built rapport with a number of his new teammates, working out this offseason with a group that included Parris Campbell, Saquon Barkley, Isaiah Hodgins and Dexter Lawrence, who also played with Simmons at Clemson.

“Shoot, he definitely brings just his physical aspect, just how big and strong he is and how fast he is,” Hodgins told The Post. “Stretching that field sideline to sideline and doing all that. I think he just brings that, just, dog mentality of trying to come in here and help us win games. I think that’s huge for us, and he’s gonna fit in well.”

Talent is not much of a question with Simmons. What is not clear is whether he can apply it well enough to help an NFL team.

“Sometimes, it doesn’t even look like he’s running fast, but he’ll do timed sprints and get on the treadmill, and he’s got some of the fastest times,” Hodgins said. “It’s kinda crazy how he could do that.”

Hodgins compared the situation with Simmons in Arizona to his own in Buffalo, from which he was traded after playing two games last year.

“It’s kinda like a refresher,” he said. “Like OK, let me put my best foot forward. Let me go out and show the world what I have. I know he’s gonna come in here with that mentality and be ready to work.”