You shouldn't really disable and enable colliders in Unity (or really any physics engine for that matter). You can still do it if you want, if you set your other sprites collider type to None / Force None - that won't destroy the collider but rather simply moves it away into some distant point to avoid things going wrong.
There are much better ways of doing this, eg. leave the collider attached all the time as a trigger, but when you need to, set/unset a flag to say whether to ignore the collision. Its much more efficient like that as well.