Should academic experience from other domains be included on a CV?
If your undergraduate program requires a Bachelor's Thesis, graduate school admissions committees might expect to see it on your CV. Completely omitting your thesis in your CV might raise questions.

Your ability to do independent work is also important, even in another field. If your thesis work is not related to your graduate school field, I would mention it but not focus on it. (i.e., include the title and one sentence summarizing what you did). If your Bachelor's Thesis is publicly accessible (and it is a good thesis), citing it in your CV cannot hurt.