The player already has experience of Scottish football having spent two years at Partick Thistle between 2014 and 2016.
The 29 year-old returned to his home club Lierse SK for a further two seasons before returning to Scotland with Dundee.
"I am thrilled to be back in Scotland and to sign for Dundee United," said Frans.
"It is a beautiful club with an amazing fan base and I am fully focused on helping us achieve our ambitions".