Swinkels joins Exeter on a season-long loan.
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He spent the second-half of last season on loan at Bristol Rovers, where he played 18 times and scored twice.
"Sil is a young centre-half we have been chasing all summer, from his loan at Bristol Rovers last year," manager Gary Caldwell told the club website.
"He had a difficult time there in terms of the team (Rovers were relegated), but we feel that experience will stand him in good stead and we believe he will have a big impact to play for us as both a centre-back and left centre-back.
"He is a really important signing for us."