Yes, but it is not simple. You will need to use two different styles and then use a TC (Table Entry) field with StyleRef fields as the basis for your TOC.
See my answers in these threads (with sample documents):

• TC Field based on StyleRef Fields.
• Formatting Heading 1 and Heading 2 so they show up on the same line in Table of Contents (The sample on this one has a colon, I believe.)