Hi there! First, congrats on your internship offer! So I'm not sure if you have other options that you are comparing it to? But generally I'd say yes, it's definitely OK from a business school admissions perspective. First, Sony's a big global brand so it will be a great name on your resume. Second, having experience in TV production could actually be quite unique, differentiating from other software engineers that choose a more traditional path, and it may expose you to a field that you really like!
I would still make sure that a) your skills in software engineering are going to be put to good use and b) there will be opportunities for you to develop and expand your skills during the internship. In other words, make sure that you have something to offer them but also that you will gain something from the internship too. And what you gain doesn't necessarily have to be technical skills (since you are getting this already through your degree) - it could be things like opportunities to manage a project or work in teams or make a presentation.
One last thing to note is that when it comes time to apply for business school (and good for you for thinking so far ahead

), schools will care much more about your post-university full-time work experience. So an internship is a great way to try something out! And if you do well and Sony likes you, it's always possible they could place you in a different division for a full-time role later on (if TV production turns out to not be something you like).
Hope this helps to put your "heart at peace" (I like that phrase!) and let us know if we can help with anything else!