Hi @AtakanTan and welcome to the community! 
Postman currently doesn鈥檛 have SCCM or MSI support for deploying the software to managed machines. The ability to deploy the client silently or centrally is something that has been requested by other users: Support multiple channels for installing/ updating Postman app. 路 Issue #4576 路 postmanlabs/postman-app-support 路 GitHub.
As a workaround, I鈥檇 recommend checking the GitHub thread above or look at the option brought up here: Deploy Postman via SCCM.