There kind of is if you’re good with the mouse.
First of all you’ll need to select the association so it goes orange:
Then, get your mouse and highlight the very end of the association where the dot is:
Click exactly on that dot and you’ll know if you were in the right place because you’ll be able to drag it to where you want it.
Repeat for both ends.
The simple answer is no, you can redraw the association.
You can however move the association and the objects to clear up you domain model.
Based on this question, which I have too, I submitted the following Idea:
Mendix Idea #2176
See if you like to vote for it.
What Rob de Leeuw said worked for me. However it is important to note that one must click within the black dot of the association for this to work. It should not make a white dot – which will indicate the creation of a new association.
Please refer section 3.3