They could mean the same, but the second guy definitely has to do a little work to come up with the sandwich. " He might be at home, announcing his intention to make a sandwich, or requesting that someone make one for him. Or he may be at work, announcing his plan to take a lunch break, and have a sandwich from his lunch pail, or possibly travel somewhere to get one.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.