The agency has been tasked with developing the "next phase of the brand positioning and a new creative platform". The work was previously handled in-house.
AnyVan.com has a network of van drivers that people can access through reverse bidding when they need to move large household goods.
Angus Elphinstone, who founded AnyVan.com in 2009, said: "We have grown significantly in recent years but now feel the time is right to bring in some external help to take our brand to new heights.
"Innocean UK are a team full of bright and talented people with an entrepreneurial streak."