I will refrain from making any sort of comment about TCD's post as I REFUSE to argue with him about the pecs anymore, however, yes, you can still train the delts when the pecs are sore. Just make sure all overhead presses remain just that...overhead presses! I see some guys in the gym lean back so much during this exercise that they turn it into an incline press!
You may also wish to pre-exaust the delts with side and rear laterals before going to presses to better feel the delts without the interference of the chest. Or, if your chest is just crazy sore, you can forgo presses and just use all lateral movements and upright rows to work your delts.
Finally, you can train chest and delts on the same day like I do right now...