After a hard three-season relationship with Honda, McLaren in September negotiated a release from its contract, with the team signing up to field Renault engines for 2018.
In creating the new role, Honda said it is splitting the responsibilities formerly held by Hasegawa, with Tanabe responsible for "directing the team at the spot of racing and testing".
As Honda moves on from its partnership with McLaren to a new one with Toro Rosso, Hasegawa's position is now being split into two, with the role of technical director (for trackside operations) now falling to one Toyoharu Tanabe.
Motorsport.com has learned Yasuaki Asaki will take the role of operating officer at Sakura in charge of Formula 1 engine development. Now employed as a senior manager at Honda Performance Development in the US, Tanabe has been with Honda since 1984, working in F1 alongside the likes of Gerhard Berger (at McLaren) and Jenson Button (at BAR-Honda) as well as in IndyCars.
Honda has restructured its under-performing Formula One operations after the split from McLaren, with Yusuke Hasegawa to stand down as head of the Japanese company's F1 project at the end of the year.
Honda says he will use his experience and knowledge from the F1 project to work on various global research and development projects focused on future mass production.
Katsuhide Moriyama, chief officer for brand and communication operations, said in a statement that "Honda will continue its challenges so that fans can enjoy seeing Toro Rosso-Honda competing at the top level without further delay".
"By separating these areas of responsibility, we will evolve our structure so that both the development team and racing/testing team can assume their respective responsibilities more speedily".