Routing the circuit for a snubber diode on a PCB?
The circuit idea is fine and so is keeping the ground/power plane away from the protection device. If you are able to define a component shape/footprint/decal in eagle then, define an SMD component with two pins that are connected by a solid lump of copper. The copper is part of the component footprint.

Thus when you route your connections, there will be one component that looks like a piece of track - make the pin connections as thin or as wide as you want to suit the track you are wanting to route.

I've used OrCAD layout and mentalgraphics PADS and this is the only sensible way I've found to deal with the problem. I haven't used EAGLE but maybe someone knows a work-around?