The sustainability of the marketing insights on the critical success factors for the sales sector of Oman is the misplaced orientation of small-scale business. This reflects the need for critical success factors for using the small and medium enterprises (SMEs) sales sector that drive businesses to explore the practical outcomes of sustainability. The objectives of this paper are to investigate the sustainability of the SMEs in the Omani sales sector and to assess critical success factors of the sales sector in Oman that include the latest technology, working capital, marketing knowledge, advertisement, marketing control, operations management, and outsourcing access environment. These factors are analysed and tested through the Statistical Package for Social Sciences (SPSS) software with the correlation, regression, and reliability tests. The result of the paper provides the effective critical success factors role in the sustainability of small businesses in the sales sector of Oman. It shares the marketing insights for the managers, stakeholders, and workers of the sales sector of SMEs in Oman. The practical implications of the research are extended to the authorities of small businesses that are related to the policy formulation and small-scale business decisions in Oman.