Joshua Corbett, 39, had already pleaded not guilty to charges of burglary, stalking and possession of a machine gun following his arrest last week.
He now faces 19 additional charges after a weapons cache was found at his California home.
Sandra Bullock was at her Los Angeles home during the alleged break-in.
According to his lawyer, Joshua Corbett suffers from serious mental health issues and did not intend to harm the Oscar-winning actress.
Joshua Corbett faces up to seven years and four months in prison if convicted on the three earlier counts.
The new charges could see Joshua Corbett sentenced to an additional prison term of up to 12 years.
Sandra Bullock was said to be “unharmed and fine” following the June 8 incident.
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