Can you please elaborate?You already have one. That's pretty much how Yosemite's designed.
I am a content developer. I scour the WWW for information on a topic that I'm working on. I also use reverse image searches. I've already encountered links that look ok before clicking then leads me to a disreputable website. At times, I also manage my clients' files on their host.Some additional details of what you are trying to do and some specifics on your system might prove helpful.
From a cursory overview of Sandboxie, I'm inclined to agree with cradom: that's how OS X is designed from the ground up. This Ain't Windows.
Thanks vansmith. I'll look into these.Sandboxie is very different than the sandboxing functionality built into OS X. The built in sandboxing doesn't work for those apps that don't voluntarily subject themselves to it. This is why Apple has an app sandbox howto on their developer site (here); if a developer doesn't sandbox their app, it ain't sandboxed.
#tag, Apple has some utilities that you can use to sandbox apps. See here for more info.