Not possible. If you have an iPhone you can Airplay to a compatible Sonos speaker, and bond a Sub to it as well. The Sonos web site will let you research speaker options, giving you prices and dimensions to let you make informed decisions on products to meet your needs. 

Let’s not forget some speakers can have a Bluetooth connection established for Android and iOS devices, but it depends on which Sonos device is in use. Not all contain the electronics to receive either AirPlay 2 or Bluetooth. 

However, Sonos only allows a single Sub to be connected to one ‘room’ , unless that ‘room’ is set up as a home theater ‘room’, in that context only do they allow two Subs to be in the same ‘room’. 

Yup, I missed the Bluetooth option in my reply. Thanks, Bruce. 
 

Please note that when dual Subs are used in home theatre setups, Gen1 and Gen2 are not supported in this mode. At least one will need to be Gen3 or Gen4 depending on the soundbar:
https://support.sonos.com/en-gb/article/set-up-your-sonos-sub?utm_source=www-care&utm_medium=sonos-sub-4%2Fcompatible-products&utm_campaign=en-gb-www-care-sonos-sub-4%2Fcompatible-products

And thank you for that. Something I knew, but didn’t include in my reply. There are all sorts of issues using a pair of gen 1 and gen 2 subs and trying to get them to play the same content at the same time. They can still be resolved by using them in separate ‘rooms’ in the Sonos software, then grouping the two rooms, but that probably isn’t what the OP was envisioning ;)

Just to be sure. You only have two Subs?

​@106rallye​@Airgetlam​@nik9669a 

You guy’s must be clairvoyant as you have offered advice to the OP who appears to only have two sub My hat’s off to you all. Well Done…I think 

That was the inference from the original question, and is the only speaker listed in the op’s profile - which I will check before providing information on a lot of questions I respond to on these forums (including this one). 
 

That’s the reason for my question. Better to have OP explain this.