ISNULL twice for the same column

ISNULL twice for the same column

Is it possible to use ISNULL twice for the same column?
ISNULL(ISNULL(column, SELECT sum(column2) FROM table WHERE type = '1')),
SELECT sum(column2) FROM table WHERE type = '2'))
Or should I be doing this in a different way with IF ELSE somehow? How
would that look like?