This paper proposes a model to study the arrangement of Islamic project finance with the participation of the government as provider of loan guarantees. The entrepreneur (musharakah) initiates a project and raises funds by issuing Islamic profit sharing debt instruments (mudarabah). The government intervenes in providing financial guarantees in order to enhance the creditworthiness and increase the debt capacity of the project. Our work raises several policy implications related to the structuring of Islamic project finance and the participation of both government and multilateral public agencies such as the Islamic Development Bank. It provides a unifying framework for the improvement of access to funds for Islamic projects and gives a rationale for the government intervention in the arrangement of those projects.