Depends on what your day job is.
If you can sit in front of the screen on a daily basis without interruption and can trade without impacting your ability to do your day job, then I'd say the answer is yes.
However, like others have said, it's a long shot and really the only way I can see it working is if you're already working in the capital markets in some fashion. As many have said, intra-day trading isn't something you do profitably in your spare time, you either devote the time necessary to be successful or you lose money.
My example? I trade high yield debt for a financial services company in TX so I'm sitting in front of the screens all day whether I'm trading equities/options/futures/currencies or not. I'm already following all the indicators, so trading my P/A on the side isn't distracting to my day job and actually helps keep me focused on what the market is saying during the day as we're a buy and hold investor, so I'm not moving huge volume in and out of our portfolio on a daily basis (meaning long down periods where my sole job responsibility if following the markets and relaying information to our analysts/PM's as necessary).
Personally, if I had a job that didn't allow me to sit in front of the screens and pay attention to what was going on in the market, I'd be out of my mind to try and trade anything.