Contemporary business organizations highly depend on outsourcing for success in today’s competitive marketplace, and selecting a suitable supplier is an important process as developing new products. Supplier selection is one of the most important decisions of supply chain management which is upstream management. As organizations become more dependent on vendors, the direct and the indirect consequences of poor decision- making become more severe. There are a lot of methods to determine the best matched supplier for a particular product. In this study, at first, we have calculated the weighted values (Using AHP) for different product for different vendors. Then we have proposed a vendor selection model using Integer Linear Programming (ILP) Model for multi-product, multi-vendor environment. The contribution this research lies in the implementation of this model as a customized decision support system according to the expectation of any company. The model is validated with a case study by implementing the model for managing the best suppliers for knit fabrics of a renowned textile industry of Bangladesh.