Plenty of jobs involve international travel, but as has been previously stated it's not usually particularly glamorous as you won't have any choice in where you go, what you do or how long you stay there, and you will be staying in bland business hotels and spending your days in bland offices, rarely having much time to see any sights.
I was once offered a job which would have involved regular travel to Greenland as well as Canada, Texas and all of Europe, which would have involved travelling 3 days in every week. Most jobs will involve just one or two trips a year, but it does vary. Jobs I've known of where friends and acquaintances have travelled include Sales, Merchandising, IT Project Management, Marketing and Call centre management. The latter is pretty much guaranteed to involve travel at some point to various industrial estates in the Netherlands, Philippines, Costa Rica and/or India.