(require 'org)
(defun org-sparse-tree-indirect-buffer (arg)
  (interactive "P")
  (let ((ibuf (switch-to-buffer (org-get-indirect-buffer))))
    (condition-case _
        (org-sparse-tree arg)
      (quit (kill-buffer ibuf)))))
(define-key org-mode-map (kbd "C-c /") 'org-sparse-tree-indirect-buffer)