Google eventually doesn't want any websites which send spam mails, malicious softwares, and anything violate laws including DMCA. They deny that they do have sandbox for the unwanted websites to list on their listing, but it is against the federal laws and international laws to offend anyone in the world. There are many federal offenders arrested by FBI or any government authorities who committed cybercrime to hack or offend someone or any organizations for crimes. I think Google doesn't want those to be listed since they will get prosecuted for ignoring the crimes also. You can get rid of sandbox by changing the .htaccess and sitemap, then you need to improve your site with many links from good PR sites. I hope this can help.
-Google sandbox is "Hell" - Bad sites (or better, bad backlink'ed sites) go there and noone ever finds them again! -Google Pagerank (1-9) is "Heaven" - Good sites go there! (9 is the best and everyone finds them!)
Never heard of a google sandbox, I know paypal has a sandbox, but I've heard of google penalty and I hate it.