No, it's not possible to get Spybot Home without the antivirus. However, if you wanted to still get Spybot Home +AV while keeping your current antivirus, what you could choose to do is disable either Spybot's Live Protection, or if your antivirus has real-time protection, you could choose to disable that, whichever you prefer, so that there is only one real-time/live protection running. That is so that there would not be two real-time protection components running on your computer at the same time, which could use up resources and cause conflicts. Please see here.
https://www.safer-networking.org/faq...bot-antivirus/