Sandbox is term used to identify the google penalty. If your sites has been removed by the google from all search result, then it can be sandbox.

The Google Sandbox is an alleged filter placed on new websites. The result is that a site does not receive good rankings for its most important keywords and keyword phrases. Even with good content, abundant incoming links and strong Google PageRank, a site is still adversely affected by the Sandbox effect.

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Google Sandbox is generally used for websites which are newly launched and then arouse the suspicion of Google, usually by adding a large amount of new content in a very short period of time. This appears to Google as spam; and the Sandbox is essentially a spam filter which watches for suspicious activity, reasoning that a site which adds enormous numbers of new posts, pages and content instantly is probably filling itself with duplicate content or engaging in search engine spamming.