Hi there, welcome to the board!
As CheshireCat posted, you can use the INDIRECT() function. I personally don't like using this as it can be expensive in recalc. There are a lot of ways you can do this. Probably the least expensive would be INDEX(Sheet2!$C:$C,3,1), since the rows will move around. While I don't know what this application is for (which always gives us a better idea of what solutions would be best suited for your needs), I will tell you that a spreadsheet model where you don't need to insert/delete/cut anything is almost always better off. That being said I have no idea what you're doing orif this is applicable.