Service Oriented Architecture (SOA) is a revolutionary paradigm for developers in order to gain on time and cost. Software-as-a-Service (SaaS) is a delivery model which gain in enormous economy in deployment, management. In this paper, the authors have proposed a model that re-defines the architecture of SOA in way to provide SaaS as its delivery model. The proposed model meets all requirements of SaaS and elaborates on mechanisms for interfacing with customer and partner services. They also propose unified meta-data management.