No, this won’t work. The Arc needs to be connected to a TV with HDMI ARC or eARC.

Consider getting the HDFury Arcana eARC adapter. It will allow your Blu-ray player to bypass your TV and send audio directly to the Arc. I use it with my old TV that only has HDMI ARC and it works great. I can get lossless Dolby Atmos, Dolby TrueHD, and multichannel PCM from all of my Blu-ray discs.

https://hdfury.com/product/4k-arcana-18gbps/

Thank you for your advice. I’ve checked out the HDFury Arcana and this looks like the way to go. I’ve just read the ‘Trusted Reviews’ review of the Arcana (awarded it 4.5 stars). They also suggested getting a HDMI switch to use with the Arcana to plug in my other external source - Virgin media box as well as my blue ray player. 

This ROOFULL HDMI switch works well with the Arcana:

https://www.amazon.com/dp/B07CF793HQ/

HDFury also recommends using KabelDirekt, Zeskit, or Cable Matters HDMI cables to connect your external media devices to the Arcana.

checking to see an update with this? i am kinda running into a similar issue where i want to pull audio from my TV that i will put outside while the sonos amp is inside (75foot cable run).

Update to what?
 

There would be no reason for Sonos to change the need for an ARC connection in favor of a regular HDMI connection, until such point as they decide that they want to change all of their hardware from ARC to HDMI passthrough, rewrite all the software to act as an HDMI switch, and add multiple HDMI inputs instead of the single ARC input to all their devices.

Essentially, don’t hold your breath. 

Or is there some other ‘this’ that you’re referring to?

You can Group an AMP with the SONOS ARC or BEAM. AMP will then play anything currently playing through the SONOS ARC or BEAM.