I suppose that you mean Certified Information Systems Security Professional (CISSP). Basically, CISSP is developed specifically for the qualification of professionals in information security. However the philosophy of ISO 27001 is different because is not developed for the qualification of professionals, is developed for the certification of companies. Basically ISO 27001 is an International Standard that has requisites for the establishment of an Information Security Management System, and there are companies in all the world that implement these requisites to obtain the ISO 27001 certificate.
And there are many entities that offers a ISO 27001 Lead Auditor certification or ISO 27001 Lead Implementer certification for people that is interested in implement or audit ISO 27001, but as you know it is different from CISSP.
Anyway, the knowledge that you need to obtain CISSP generally is more technical, because ISO 27001 is rela ted to the management of the information security and there are things not only related to IT.