You could do several things. The easiest would likely be to boot off of CD or USB and just format the drive through your OS installer. If you want to decommission it via SG, there is a link here: https://www.sophos.com/en-us/support/knowledgebase/108268.aspx - this is just to remove the keys used by SGN. If your policies a) don't allow decrypt, b) don't allow booting to any external devices, you can pull the drive and format it externally then replace into the computer. Or, if you can boot CD or USB, you can use DBAN to do a quick pass to nuke all contents.
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