This paper presents the design of temporary cofferdam structure for new dry dock. For this, construction of temporary dewatering has to be done at the dry dock area for excavation and safeguarding the work area and keeping dry. The temporary cofferdam can be built in such a way that the entire length of pile sheet piles can be installed and removed easily. Hence, cofferdam with steel sheet pile and beams is proposed based on geological and site constraints. In this paper, discussion about a temporary dewatering at the dry dock location is necessary to isolate the proposed work area. This method provides safe environment to work, and materials can typically be reused on other projects. The 2D analysis using Staad pro has been carried out. © 2021, Springer Nature Singapore Pte Ltd.