The 20-year-old, who had spells on loan at Crystal Palace and Coventry last season, has joined the Iron for a month and is set to make his debut against Preston.
"It feels good to be here," Sears told Iron Player.
"I got a phone call on Sunday night saying that Scunthorpe wanted to take me.
"As soon as I heard they were interested I wanted to come down and get going really.
"It went through on Monday and I travelled up on the night before completing the deal on Tuesday morning."