Rumours of a split arose last year when members Kim Gordon and Thurston Moore announced their separation after 27 years of marriage.
Speaking to Spinner, Ranaldo said: "[Our future] is up in the air. We're taking a much-needed break and leaving it at that.
"We're not saying anything final, but we're not discussing anything for the future either. We're just letting it be."
He added: "Our lives and careers are so intertwined that, even if nothing is happening as far as new recordings and new performances, we'll be tied to each other.
"We've had an amazing 30-year run. We'll see what the future holds."
Sonic Youth's last studio album was 2009's The Eternal.
Ranaldo previously hinted that the band might have "run its course" in November last year. He released his ninth solo LP Between The Times And The Tides last month.
Watch the video for Sonic Youth's 'Electricity' below: