Developing countries face an annual financing gap of US$2.5trillion in order to achieve the United Nations 2030 Sustainable Development Agenda. Private investments are seen as indispensable in efforts to close this gap and foreign portfolio investments fall under this financing bracket. However, foreign portfolio investments flowing to Sub-Sahara Africa are relatively low and inconsistent. This paper uses international finance theory and behavioralfinance to examine the determinants of foreign portfolio investments on a sample of seventeen Sub Saharan countries using panel data from 2000 to 2019. Using the Pooled Ordinary Least Squares method, the study establishes that negative economic and institutional factors of high inflation, weak exchange rates and low political stability are significant determinants of the flow of foreign portfolio investments in Sub Sahara Africa. In view of the findings, recommendation is made for Sub Saharan governments to pursue policies that stabilize the macroeconomic and political environment. Further, a recommendation is advanced for international investment fund managers to adopt top-down approach where the analysis begins at country level and prioritize investment destinations with stable indicators.