How can I create a line that loops behind itself? Similar to a knot?

[crackerjackjack]

I’m struggling trying to figure out how to make a line loop back and go either above or behind itself.

In the attached example I would like the red line to go above (over top) the green line at the one intersection and below (under) at the other.

Is that possible?

[FWP]

One way is to first draw the shape in 2 dimensions and then select an endpoint of one of your lines and use the move/rotate tool.