Farrell's position as director of marketing meant he was a key member of the management team behind Daewoo's marketing strategy when the company launched in 1995. He became sales and marketing director in late 1997 and took registrations to a record level of 32,544 in 2000.
Individual managers will now report directly to Daewoo Cars' managing director, SK Kim.
The company confirmed it was close to appointing a head of dealer development to implement the new retail strategy. Earlier this year, the manufacturer denied it was giving up on the fleet market despite plans to restructure its fleet department.