The sandbox is a pretty old term now. It still applies somewhat, but what was the status quo three years ago when the sandbox was "invented" is very different than today.
Either buy a high PR link or do a sitemap and submit it to Google. High PR links work fast. If you can affors a link on a PR7 or PR8 site you will be set in Google's eyes. Probably be indexed within 24 hours.
__________________
"Doing nothing is very hard to do...you never know when you're finished. "