A format I followed was to link an element/feature of the program the SOP was for with each of my project/research interests, mentioning it immediately after I explained my interest. For example, when I wrote about building a tool which I eventually want to launch as a startup in the near future, I followed it up by mentioning the entrepreneurial classes and venture lab in that university to show that I have a charted trajectory for this program and that I can build on my specific goals and aims using program facilities.