Possibly. Everyone so far since the advent of nukes has generally abided by not shooting each other’s surveillance down in international territory (water, space, etc.) But perhaps that would change if UUVs are following subs.

Also I suppose the sub could re-enter its own coastal waters and then do it too, much as we shot down China’s spy balloon.

That, and also, as pointed out in e.g [1], a "boomer" submarine can launch all its SLBMs in 60-90 s. Faster than it could be torpedoed. And even if you manage to disable it very quickly, just a few launched missiles mean multiple times that number of warheads (MIRV).

[1] Annie Jacobsen, "Nuclear War: A Scenario"