Wow, sounds like an egg laying dairy pig, lol. You want fries with that? And maybe WiFi?
Snarky aside (you do have thick skin, right?), consider:
Beam break sensors and PIR sensors typically have relay contacts as outputs. If you wanna replace a relay with something powerful enough to have handle ip communications (the communications protocol stack, assorted protocols, configurability, security, etc), then the device would be expensive.
Short answer: No, I've never heard of such a device. Maybe others have, tho...
IR break beam sensors that can integrate into a network?
Maybe check "Home Automation".
Or look for a rasberry pi solution.
I was hoping someone might make something more plug and play, maybe even poe,
I've used POE to power some of my sensors using a poe power splitter. One cable (I use Cat 5) that carries the relay closure back to the NVR, or to the cam's "external alarm input".
My sensors are "integrated into my network", thanks to the cams and NVR. Secondly, the NVR and cams provide "alarm output", to energize strobes, sirens, or buzzers. So things are "integrated"...
The DIY community may have a hack or raspberry solution, if you can fabricate the pieces and do some coding...
Regards,
Fastb