Scope of ISO 27001 for a software project

You can include in the scope of the certification the activities related to your software project, processes related to your software project, department that works on this project, or you can certify all activities related to the whole company. However, you cannot certify only the project itself - the point is that your organization is certified, not your product. 

For more information about the definition of the scope, you can read this article: “How to define the ISMS scope”: https://advisera.com/27001academy/knowledgebase/how-to-define-the-isms-scope/