Can I still get a divorce if my spouse refuses to sign?

Yes if you can establish fault grounds.

If you're trying to get a "no fault" divorce it will require both you and your spouse to sign the joint petition befrore the judge will sign the judgment granting the divorce. If your spouse refuses to sign the joint petition, then you will have to file a petition and secure the divorce on a "fault" ground, which will require you to show up in court and give testimony to prove the grounds that you allege entitles you to receive the divorce.